Thread safety for status updates, periodically minify

vm/function.go

@@ -3,3 +3,13 @@ package vm
 type Function struct {
 	Instructions []*Instruction
 }
+
+func (fnc *Function) Copy() *Function {
+	ret := &Function{}
+
+	for _, instr := range fnc.Instructions {
+		ret.Instructions = append(ret.Instructions, instr.Copy())
+	}
+
+	return ret
+}